Planning Use Case: Increasing Virtual Load under Existing Constraints

Document created by Michael Scott Expert on Oct 16, 2015Last modified by fran.schwarzmann on Aug 15, 2016
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Increasing Virtual Load under Existing Constraints

Assume you want to determine the load distribution if you add more VMs to your environment. To do this, you would create a Workload Distribution scenario that adds the new VMs, and then determines the best way to run existing and new load on your physical hosts and datastores.


Your environment already has its physical systems assigned to clusters and resource pools. As you add VMs to the environment, you want to respect these constraints. When thinking about this scenario, imagine asking, “What would happen if I add ten VMs running Web servers, and ten VMs running database servers? How can I optimally deploy these VMs in my current environment?”


To plan out the best way to add these VMs to your inventory, you can create a Workload Distribution scenario that:

  • Specifies how many VMs to add
  • Uses an existing Web server VM as a model for your new Web server VMs
  • Uses an existing database VM as a model for your new database VMs


The following steps show how to create such a scenario in the Plan view:

  1. Start a New plan to add VMs.

     Click the NEW button (image) to open the Plan Wizard, and choose the Added VMs scenario. This clears the loaded plan so you can specify a new plan based on your current environment.image


2.  Define the scope of the plan.

     By default, a plan loads a snapshot of your complete environment. Setting scope to the plan limits the processing to only those parts of the environment that      interest you for this scenario. When you’re done, click Next.


3.  Edit the load for your plan.

     For this plan you will add 20 VMs to your environment. Use the Wizard to choose the VMs to add.

  • Specify the properties of the VMs that you will addFor this scenario, you will add copies of existing VMs to your load. Copying existing VMs is just one way to specify the properties of your new VMs. Expand a VM group and select the VM you want, then click Add.image
  • Now select another VM to copy, and add 10 more VMs to your loadBe sure to click Add after you have selected the new VM to copy.image

4. Now that you have defined the new load, close the Wizard and run the plan.Click the run button to see the planning results(image). For information about run options, see Running Plans.Before running the plan, you should verify the setup to make sure it is as you intended:image

Note that you can make more changes to the plan before running it. For example, to plan for a recurring peak load you can run the scenario against a load that occurred in the past. Or you can change the supply of physical hosts. After making these other changes, you would then click Run to execute the plan.


5. When Operations Manager is finished running the plan, it displays the results.

For information about this Results view, see One-time Plan Results.

Note that in this case the plan recommends provisioning three new hosts. This tells us what the optimal supply would be for the added demand, but it does not tell us whether the cluster could support the workload without adding these hosts. The next step will force the plan to run without provisioning new hosts.image

6.  In the same plan, edit the Advanced Settings.  Use the Advanced Settings dialog box to disable host provisioning.image

7. Run the plan with the new settings.


The results now show that you can support the new workload without adding hosts.



Go Back To:

Planning Use Cases


Go Back To:

The Plan View Glossary

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